Is there a way to create a page in long living branches section? As far as I know the only thing we can setup in the PageDefinition is the Scope (available values are COMPONENT, GLOBAL or ORGANIZATION). But the section only appears in the main branch, and it is missing on long living branches.

Hello!
It’s not possible yet, like you said, currently extension page only shows for the main branch.
We have a ticket in the backlog about this but nothing done yet, you can vote for this ticket, to increase priority on this : SONAR-9964